Github user cloud-fan commented on the pull request:
https://github.com/apache/spark/pull/10209#issuecomment-163627935
This looks very cool!
But I'm a little worried about making the `Join` stateful, how about adding
a new batch in `Optimizer` and only execute it `Once`? So that we can avoid
having the join regenerate the filter as your rule will be applied after all
other optimization rules.
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